Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 224	$ 128
Liability Fair Value	285	99
Counterparty netting, Assets	(217)	(88)
Counterparty netting, Liabilities	(217)	(88)
Cash collateral netting, Assets	(6)	(37)
Cash collateral netting, Liabilities	(58)	(2)
Securities collateral netting, Assets	0	0
Securities collateral netting, Liabilities	(5)	(9)
Net receivables	1	3
Net payables	5	0
Equity contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	63	98
Asset Fair Value	4	1
Liability Fair Value	3	1
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	706	632
Asset Fair Value	10	10
Liability Fair Value	19	20
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	17,621	17,478
Asset Fair Value	210	117
Liability Fair Value	261	76
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	182	201
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

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