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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 ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | $ (478) |  | $ (339) | $ (94) |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (91) |  | (54) | (117) |
Gain (Loss) on Derivative Instruments, Net, Pretax | (1) |  | (52) | 173 |
Interest Rate Contract |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | (511) |  | (290) | (16) |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (75) |  | (28) | (52) |
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 0 |  | 0 | (7) |
AOCI before tax expected increase (decrease) next 12 months | (98) |  |  |  |
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring | 0 | [1] | (2) | 0 | [1]
Cross Currency Interest Rate Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | 3 |  | (26) | (26) |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (5) |  | (12) | (43) |
Foreign Exchange Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | 25 |  | (23) | (52) |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (9) |  | (13) | (16) |
Gain (Loss) on Derivative Instruments, Net, Pretax | 68 |  | (46) | 148 |
Commodity Contract [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Losses) Recognized in AOCL, Effective Portion | 5 |  | 0 | 0 |
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion | (2) |  | (1) | (6) |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (68) |  | $ (6) | $ 25 |
[1] | Cash flow hedge was discontinued on a cross-currency swap in 2019 because the underlying debt was prepaid.

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- Definition The pre-tax accumulated other comprehensive income (loss) expected to be recognized as an increase (decrease) to income from continuing operations before income taxes over the next twelve months as of the balance sheet date. + References No definition available. + Details
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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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