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Debt (Details 2) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jan. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Debt |  |  |  |  |
Repayments of senior notes |  |  | $ 149 |  |
Outstanding letters of credit | $ 63 |  | 63 |  | $ 87
Senior unsecured 364-day revolving credit facility |  |  |  |  |
Debt |  |  |  |  |
Expiration period for credit facility |  | 364 days |  |  |
Borrowing capacity | 1,000 | $ 1,000 | $ 1,000 |  |
Basis Variable interest rate used |  |  | Eurocurrency Rate or the Base Rate |  |
Credit agreements and commercial paper program |  |  |  |  |
Debt |  |  |  |  |
Total borrowings |  |  | $ 17,900 | $ 34,600 |
Total repayments |  |  | 17,700 | $ 34,900 |
Senior notes |  |  |  |  |
Debt |  |  |  |  |
Debt instrument face value | 9,200 |  | 9,200 |  | 9,300
Senior notes | Level 2 |  |  |  |  |
Debt |  |  |  |  |
Debt instrument fair value | 9,400 |  | $ 9,400 |  | $ 9,900
5.25% senior notes due June 2015 |  |  |  |  |
Debt |  |  |  |  |
Repayments of senior notes | $ 150 |  |  |  |

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