|
Debt (Debt) (Details) (USD $)
In Millions, unless otherwise specified |
Mar. 31, 2013
|
Dec. 31, 2012
|
|---|---|---|
| Debt Instrument [Line Items] | ||
| Long-term Debt | $ 10,777 | $ 10,750 |
| Debt, Current | 144 | 115 |
| Long-term Debt, Excluding Current Maturities | (10,633) | (10,635) |
|
Corporate Debt Securities [Member]
|
||
| Debt Instrument [Line Items] | ||
| Long-term Debt | 5,304 | 5,303 |
|
Notes Payable, Other Payables [Member]
|
||
| Debt Instrument [Line Items] | ||
| Long-term Debt | 2,456 | 2,463 |
|
Loans Payable [Member]
|
||
| Debt Instrument [Line Items] | ||
| Long-term Debt | 1,826 | 1,789 |
|
Secured Debt [Member]
|
||
| Debt Instrument [Line Items] | ||
| Long-term Debt | 980 | 978 |
|
Capital Lease Obligations [Member]
|
||
| Debt Instrument [Line Items] | ||
| Long-term Debt | $ 211 | $ 217 |