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Risk Management - FV Hedging Effect on Income Statements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |
Cumulative amount of fair value hedging adjustments to hedged fixed rate debt | $ 702 | $ 359 |
Designated as Hedging Instrument | Fair Value Hedging | Hedged Fixed Rate Debt |  |  |
Derivative [Line Items] |  |  |
Cumulative amount of fair value hedging adjustments to hedged fixed rate debt | 702 |  |
Designated as Hedging Instrument | Fair Value Hedging | Interest, net [Member] | Interest Rate Contract |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives and related hedged item | 335 | 340 | $ (122)
Designated as Hedging Instrument | Fair Value Hedging | Interest, net [Member] | Hedged Fixed Rate Debt |  |  |
Derivative [Line Items] |  |  |
Gain/(loss) recognized in income on derivatives and related hedged item | $ (343) | $ (353) | $ 113

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged liability in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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