Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 677	$ 224
Liability Fair Value	736	285
Counterparty netting, Assets	(615)	(217)
Counterparty netting, Liabilities	(615)	(217)
Cash collateral netting, Assets	(58)	(6)
Cash collateral netting, Liabilities	(121)	(58)
Securities collateral netting, Assets	(2)	0
Securities collateral netting, Liabilities	0	(5)
Net receivables	2	1
Net payables	0	5
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	58	63
Asset Fair Value	2	4
Liability Fair Value	2	3
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	748	706
Asset Fair Value	55	10
Liability Fair Value	1	19
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	17,007	17,621
Asset Fair Value	620	210
Liability Fair Value	731	261
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	197	182
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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[Line Items] for Offsetting Assets and Liabilities [Table]

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