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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Effective Portion of Cash Flow Hedges) (Details) - Cash Flow Hedging - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | $ (73,000,000) | $ (430,000,000) | $ 139,000,000
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (77,000,000) | (125,000,000) | (180,000,000)
Interest Rate Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | (103,000,000) | (421,000,000) | 155,000,000
AOCI before tax expected increase (decrease) next 12 months | (106,000,000) |  |
Interest Rate Contract | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (108,000,000) | (139,000,000) | (127,000,000)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring | 6,000,000 | $ 0 |
Cash flow hedge additional transaction period |  | 2 months |
Interest Rate Contract | Cost of Sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (2,000,000) | $ (2,000,000) | (5,000,000)
Interest Rate Contract | Net Equity In Earnings Of Affiliates |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (2,000,000) | (3,000,000) | (6,000,000)
Interest Rate Contract | Sale of Subsidiary Gain (Loss) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (4,000,000) | 0 | (21,000,000)
Cross Currency Interest Rate Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | (20,000,000) | (25,000,000) | (18,000,000)
AOCI before tax expected increase (decrease) next 12 months | (3,000,000) |  |
Cross Currency Interest Rate Contract [Member] | Interest Expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (4,000,000) | 0 | (10,000,000)
Cross Currency Interest Rate Contract [Member] | Foreign Currency Gain (Loss) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (20,000,000) | (23,000,000) | (18,000,000)
Foreign Exchange Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | 10,000,000 | (28,000,000) | 0
AOCI before tax expected increase (decrease) next 12 months | 12,000,000 |  |
Foreign Exchange Contract [Member] | Foreign Currency Gain (Loss) |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | 32,000,000 | 14,000,000 | 12,000,000
Other Contract |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | 40,000,000 | 44,000,000 | 2,000,000
AOCI before tax expected increase (decrease) next 12 months | 16,000,000 |  |
Other Contract | Cost of Sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (12,000,000) | (2,000,000) | (2,000,000)
Other Contract | Sales |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | $ 43,000,000 | $ 30,000,000 | $ (3,000,000)

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