Fair Value Measurements And Disclosure (Fair Value Leveling) (Details) (USD $) | Mar. 31, 2015 | Dec. 31, 2014 |
In Millions, unless otherwise specified |
Interest Rate Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | $194 | $157 |
Cross-Currency Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 706 | 1,243 |
Liability Derivatives (at fair value) | -3,528 | -1,506 |
Interest Rate Locks [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | | 5 |
Liability Derivatives (at fair value) | -444 | -133 |
Domestic Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 1,176 | 1,160 |
International Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 592 | 553 |
Fixed Income Bonds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 793 | 836 |
Level 1 [Member] | Interest Rate Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 0 | 0 |
Level 1 [Member] | Cross-Currency Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 0 | 0 |
Liability Derivatives (at fair value) | 0 | 0 |
Level 1 [Member] | Interest Rate Locks [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | | 0 |
Liability Derivatives (at fair value) | 0 | 0 |
Level 1 [Member] | Domestic Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 1,176 | 1,160 |
Level 1 [Member] | International Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 592 | 553 |
Level 1 [Member] | Fixed Income Bonds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 0 | 0 |
Level 2 [Member] | Interest Rate Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 194 | 157 |
Level 2 [Member] | Cross-Currency Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 706 | 1,243 |
Liability Derivatives (at fair value) | -3,528 | -1,506 |
Level 2 [Member] | Interest Rate Locks [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | | 5 |
Liability Derivatives (at fair value) | -444 | -133 |
Level 2 [Member] | Domestic Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 0 | 0 |
Level 2 [Member] | International Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 0 | 0 |
Level 2 [Member] | Fixed Income Bonds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 793 | 836 |
Level 3 [Member] | Interest Rate Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 0 | 0 |
Level 3 [Member] | Cross-Currency Swaps [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | 0 | 0 |
Liability Derivatives (at fair value) | 0 | 0 |
Level 3 [Member] | Interest Rate Locks [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Asset Derivatives (at fair value) | | 0 |
Liability Derivatives (at fair value) | 0 | 0 |
Level 3 [Member] | Domestic Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 0 | 0 |
Level 3 [Member] | International Equities [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | 0 | 0 |
Level 3 [Member] | Fixed Income Bonds [Member] | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Available-for-Sale Securities (at fair value) | $0 | $0 |