Employee Benefit Plans (Pension and Post Retirement Asset Allocations in Accordance with Investment Guidelines) (Details) (USD $) | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 |
In Millions, unless otherwise specified |
Pension Plans, Defined Benefit [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | $12,069 | | $12,686 | | $11,812 |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,251 | | 1,225 | | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 439 | | 450 | | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,170 | [1] | 1,143 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 349 | [2] | 278 | [2] | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 81 | [1] | 82 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 40 | [3] | 103 | [3] | ' |
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 50 | [4] | 69 | [4] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 8,155 | | 8,781 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,117 | [5] | 1,108 | [5] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 506 | [6] | 567 | [6] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 266 | [7] | 221 | [7] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 2 | | 3 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,005 | | 1,154 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 636 | | 747 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 17 | | 14 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 3,676 | [8] | 3,894 | [8] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 24 | | 17 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 137 | [9] | 293 | [9] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -3 | | -4 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 28 | | 22 | | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 783 | [10] | 789 | [10] | ' |
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -39 | [11] | -44 | [12] | ' |
Pension Plans, Defined Benefit [Member] | Short-term Investments [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 79 | | 418 | | ' |
Pension Plans, Defined Benefit [Member] | Short-term Investments [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 78 | | 418 | | ' |
Pension Plans, Defined Benefit [Member] | Short-term Investments [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 676 | | 507 | | ' |
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 356 | [13] | 322 | [13] | ' |
Pension Plans, Defined Benefit [Member] | Real Estate [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 320 | | 185 | | ' |
Pension Plans, Defined Benefit [Member] | Other Investment [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,469 | | 1,305 | | ' |
Pension Plans, Defined Benefit [Member] | Other Investment [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 374 | | 598 | | ' |
Pension Plans, Defined Benefit [Member] | Other Investment [Member] | Hedge Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,095 | | 707 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 717 | | 735 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [2] | 0 | [2] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [3] | 0 | [3] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [4] | 0 | [4] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [5] | 0 | [5] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [6] | 0 | [6] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [7] | 0 | [7] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [8] | 0 | [8] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [9] | 0 | [9] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 717 | [10] | 735 | [10] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [11] | 0 | [12] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [13] | 0 | [13] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investment [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Investment [Member] | Hedge Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 9,093 | | 10,037 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,170 | [1] | 1,143 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 349 | [2] | 278 | [2] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 81 | [1] | 82 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 40 | [3] | 103 | [3] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 50 | [4] | 69 | [4] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,085 | [5] | 1,076 | [5] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 506 | [6] | 567 | [6] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 266 | [7] | 221 | [7] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 2 | | 3 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,005 | | 1,154 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 636 | | 747 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 17 | | 14 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 3,660 | [8] | 3,882 | [8] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 24 | | 17 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 137 | [9] | 293 | [9] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -3 | | -4 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 28 | | 22 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [10] | -4 | [10] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -39 | [11] | -44 | [12] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 78 | | 418 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [13] | 0 | [13] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investment [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Investment [Member] | Hedge Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 2,259 | | 1,914 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Pooled Separate Accounts Asset [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [2] | 0 | [2] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [1] | 0 | [1] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [3] | 0 | [3] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [4] | 0 | [4] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 32 | [5] | 32 | [5] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [6] | 0 | [6] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [7] | 0 | [7] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 16 | [8] | 12 | [8] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [9] | 0 | [9] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 66 | [10] | 58 | [10] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [11] | 0 | [12] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | United Kingdom Insurance Pooled Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Pooled Separate Accounts Asset [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 356 | [13] | 322 | [13] | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 320 | | 185 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investment [Member] | Partnership Interest [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 374 | | 598 | | ' |
Pension Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Investment [Member] | Hedge Funds [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,095 | | 707 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,745 | | 1,329 | | 1,344 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 880 | | 697 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 87 | | 70 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 136 | [14] | 100 | [14] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 23 | [15] | 18 | [15] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Other Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 110 | | 104 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Investment Contracts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 634 | [16] | 493 | [16] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Equity Securities [Member] | Investment Contracts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 64 | [17] | 52 | [17] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 725 | | 549 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 29 | [18] | 29 | [18] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 7 | | 12 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 289 | | 138 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 3 | | 3 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 4 | | 8 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 236 | [19] | 197 | [19] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 61 | | 57 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 35 | [9] | 70 | [9] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -7 | | -8 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 68 | [20] | 43 | [20] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [21] | 0 | [22] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Short-term Investments [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 53 | | 13 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Short-term Investments [Member] | Other Investment Companies [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 53 | | 12 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Short-term Investments [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 1 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 237 | | 163 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [14] | 0 | [14] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [15] | 0 | [15] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Other Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 110 | | 104 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Investment Contracts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [16] | 0 | [16] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] | Investment Contracts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [17] | 0 | [17] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [18] | 0 | [18] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [19] | 0 | [19] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [9] | 0 | [9] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 74 | [20] | 47 | [20] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [21] | 0 | [22] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Other Investment Companies [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 53 | | 12 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1,508 | | 1,168 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 136 | [14] | 100 | [14] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 23 | [15] | 18 | [15] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Other Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Investment Contracts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 634 | [16] | 493 | [16] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Investment Contracts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 64 | [17] | 52 | [17] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 29 | [18] | 29 | [18] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 7 | | 12 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 289 | | 138 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 3 | | 3 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 4 | | 8 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 235 | [19] | 195 | [19] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 56 | | 57 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 35 | [9] | 70 | [9] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -7 | | -8 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [20] | 0 | [20] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [21] | 0 | [22] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Other Investment Companies [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 1 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | -2 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [14] | 0 | [14] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Common Collective Trusts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [15] | 0 | [15] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Other Equity Securities [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Investment Contracts [Member] | United States Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [16] | 0 | [16] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Investment Contracts [Member] | International Entities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [17] | 0 | [17] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Common Collective Trusts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [18] | 0 | [18] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | US Treasury And Government [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Obligations of U.S. states and their political subdivisions [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Foreign Government Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Corporate Debt Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 1 | [19] | 2 | [19] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Asset-backed Securities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 5 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Collateralized Mortgage Obligations [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [9] | 0 | [9] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Interest Rate Swap Member | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Other Fixed Maturities [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | -6 | [20] | -4 | [20] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Unrealized Gain Loss On Investment Of Securities Lending Collateral [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | [21] | 0 | [22] | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Other Investment Companies [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | 0 | | 0 | | ' |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Investment Contracts [Member] | ' | | ' | | ' |
Defined Benefit Plan Disclosure [Line Items] | ' | | ' | | ' |
Defined Benefit Plan, Fair Value of Plan Assets | $0 | | $0 | | ' |
|
[1] | Â Â Â Â Â Â Â Â These categories invest in U.S. equity funds whose objective is to track or outperform various indexes. |
[2] | This category invests in a large cap international equity funds whose objective is to track an index. |
[3] | This category invests in international equity funds, primarily large cap, whose objective is to outperform various indexes. |
[4] | This category invests in an international equity fund whose objective is to track an index. |
[5] | This category invests in bond funds, primarily highly rated private placement securities. |
[6] | This category invests in bond funds, primarily highly rated public securities whose objective is to outperform an index. |
[7] | This category invests in bond funds, primarily highly rated corporate securities. |
[8] | This category invests in highly rated corporate securities. |
[9] | This category invests in highly rated Collateralized Mortgage Obligations. |
[10] | Primarily cash and cash equivalents, short term investments, payables and receivables, and open future contract positions (including fixed income collateral). |
[11] | The contractual net value of the investment of securities lending collateral invested in primarily short-term bond funds is $701 million and the liability for securities lending collateral is $740 million. |
[12] | The contractual net value of the investment of securities lending collateral invested in primarily short-term bond funds is $682 million and the liability for securities lending collateral is $726 million. |
[13] | This category invests in commercial real estate and real estate securities funds, whose objective is to outperform an index. |
[14] | This category invests in U.S. equity funds, primarily large cap equities. |
[15] | This category fund invests in large cap international equity fund whose objective is to outperform an index. |
[16] | This category invests in U.S. equity funds, primarily large cap equities whose objective is to track an index via pooled separate accounts and registered investment companies |
[17] | This category invests in international equity funds, primarily large cap international equities whose objective is to track an index. |
[18] | This category invests in U.S. bonds funds. |
[19] | This category invests in highly rated corporate bonds. |
[20] | Cash and cash equivalents, short term investments, payables and receivables and open future contract positions (including fixed income collateral). |
[21] | In 2013 the contractual net value of the investment of securities lending collateral invested in primarily short-term bond funds is $16 million and the liability for securities lending collateral is $16 million. |
[22] | In 2012 the contractual net value of the investment of securities lending collateral invested in primarily short-term bond funds is $44 million and the liability for securities lending collateral is $44 million. |