Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of the Change in Unrecognized Tax Benefits (Details)

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Income Taxes - Reconciliation of the Change in Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]      
Changes in prior period UTBs, including interest $ (255) $ (198) $ (239)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance, January 1 3,677 4,203 5,169
Increases related to positions taken during the current year 98 352 219
Increases related to positions taken during prior years (1) 254 [1] 142 [1] 879 [1]
Decreases related to positions taken during prior years (1) (508) [1] (711) [1] (1,669) [1]
Settlements (448) (205) (277)
Expiration of statute of limitations (5) (104) (118)
Balance, December 31 $ 3,068 $ 3,677 $ 4,203
[1] The sum per year of positions taken during prior years differs from the $255 million, $198 million and $239 million in the Reconciliation of Income Tax Expense (Benefit) table due to temporary items and jurisdictional offsets, as well as the inclusion of interest