Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 719	$ 224
Liability Fair Value	794	285
Counterparty netting, Assets	(619)	(217)
Counterparty netting, Liabilities	(619)	(217)
Cash collateral netting, Assets	(96)	(6)
Cash collateral netting, Liabilities	(174)	(58)
Securities collateral netting, Assets	(3)	0
Securities collateral netting, Liabilities	0	(5)
Net receivables	1	1
Net payables	1	5
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	59	63
Asset Fair Value	1	4
Liability Fair Value	0	3
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	722	706
Asset Fair Value	72	10
Liability Fair Value	0	19
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	19,176	17,621
Asset Fair Value	646	210
Liability Fair Value	792	261
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	205	182
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

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