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Income Taxes (Details 3) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance, January 1 | $ 909 | $ 1,044 | $ 1,230
Increases: |  |  |
Current year tax positions | 81 | 4 | 124
Tax positions related to prior years | 177 | 111 | 176
Decreases: |  |  |
Tax positions related to prior years | (256) | (181) | (371)
Settlements with tax authorities | (15) | (67) | (94)
Lapse of statute of limitations | (26) | (1) | (21)
Effects of foreign currency translations | 0 | (1) | 0
Balance, December 31 | $ 870 | $ 909 | $ 1,044

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