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Risk Management - Effect of Derivative Contracts on the Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative and related hedged item | $ 64 | $ 7 | $ 168 | $ 30
Derivatives designated as hedging instruments | Derivatives in fair value hedging relationships | Interest rate contracts | Interest, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative and related hedged item | 26 | 208 | 459 | 336
Derivatives designated as hedging instruments | Derivatives in fair value hedging relationships | Hedged fixed rate debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) | 827 |  | 827 |
Derivatives designated as hedging instruments | Derivatives in fair value hedging relationships | Hedged fixed rate debt | Interest, net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain/(loss) recognized in income on derivative and related hedged item | $ (28) | $ (211) | $ (468) | $ (349)

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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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