|
Risk Management Debt Fair Value Adjustment (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | |
|---|---|---|
|
Mar. 31, 2014
|
Dec. 31, 2013
|
|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Increase (decrease) in debt fair value adjustment related to purchase accounting | $ 1,340 | $ 1,379 |
| Amount the adjustment to fair value of debt was increased by related to the fair value of interest rate swaps | 198 | 143 |
| Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | 501 | 517 |
| Amount the fair value of debt adjustment was decreased by related to unamortized debt discounts | $ 70 | $ 62 |
| Amortization Period of Deferred Gain (Loss) on Discontinuation of Interest Rate Fair Value Hedge | 16 years |