Fair Value Measurements (Details) (USD $) | Jun. 30, 2014 | Dec. 31, 2013 |
In Millions, unless otherwise specified |
Fair Value Measurements Textuals [Abstract] | ' | ' |
Par Value of Structured Notes | $38 | $38 |
Fair Value of Structured Notes | 40 | 38 |
US Government and Agencies | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
US Government and Agencies | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 126 | 126 |
US Government and Agencies | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
US Government and Agencies | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 126 | 126 |
State and Political Subdivisions | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
State and Political Subdivisions | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 1,056 | 1,075 |
State and Political Subdivisions | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
State and Political Subdivisions | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 1,056 | 1,075 |
Corporate Debt Securities | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Corporate Debt Securities | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 1,771 | 1,606 |
Corporate Debt Securities | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Corporate Debt Securities | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 1,771 | 1,606 |
Mortgage-backed/asset-backed securities | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Mortgage-backed/asset-backed securities | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 101 | 109 |
Mortgage-backed/asset-backed securities | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Mortgage-backed/asset-backed securities | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 101 | 109 |
Foreign Government Bonds | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Foreign Government Bonds | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 38 | 43 |
Foreign Government Bonds | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Foreign Government Bonds | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 38 | 43 |
Preferred Stock, Available for Sale | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 40 | 73 |
Preferred Stock, Available for Sale | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 147 | 78 |
Preferred Stock, Available for Sale | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | ' | 0 |
Preferred Stock, Available for Sale | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 187 | 151 |
Equity Securities, Available for Sale | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 144 | 136 |
Equity Securities, Available for Sale | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Equity Securities, Available for Sale | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 0 | 0 |
Equity Securities, Available for Sale | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Available-for-sale Securities, Fair Value | 144 | 136 |
Other Long-term Investments [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 0 | 0 |
Other Long-term Investments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 0 | 0 |
Other Long-term Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 40 | 38 |
Other Long-term Investments [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 40 | 38 |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 0 | 0 |
Other Liabilities, Fair Value Disclosure | 0 | ' |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 7 | 2 |
Other Liabilities, Fair Value Disclosure | 2 | ' |
Foreign Exchange Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 0 | 0 |
Other Liabilities, Fair Value Disclosure | 0 | ' |
Foreign Exchange Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | 7 | 2 |
Assets, Total [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 184 | 209 |
Assets, Total [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 3,246 | 3,043 |
Assets, Total [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 40 | 38 |
Assets, Total [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 3,470 | 3,290 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 0 | 0 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 2 | 1 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 0 | 0 |
Interest Rate Swap [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 2 | 1 |
Commodity Contract [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 0 | 0 |
Commodity Contract [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Assets, Fair Value Disclosure | ' | 4 |
Other Liabilities, Fair Value Disclosure | 1 | 2 |
Commodity Contract [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | 0 | 0 |
Commodity Contract [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Other Liabilities, Fair Value Disclosure | ' | 2 |
Liabilities, Total [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 0 | 0 |
Liabilities, Total [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 5 | 3 |
Liabilities, Total [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | 0 | 0 |
Liabilities, Total [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | ' | ' |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ' | ' |
Total | $5 | $3 |