Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 215	$ 128
Liability Fair Value	334	99
Counterparty netting, Assets	(203)	(88)
Counterparty netting, Liabilities	(203)	(88)
Cash collateral netting, Assets	(10)	(37)
Cash collateral netting, Liabilities	(127)	(2)
Securities collateral netting, Assets	0	0
Securities collateral netting, Liabilities	(1)	(9)
Net receivables	2	3
Net payables	3	0
Equity contract
Offsetting Assets and liabilities [Line Items]
Notional Amount	77	98
Asset Fair Value	3	1
Liability Fair Value	2	1
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	703	632
Asset Fair Value	15	10
Liability Fair Value	15	20
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	17,962	17,478
Asset Fair Value	197	117
Liability Fair Value	315	76
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	170	201
Asset Fair Value	0	0
Liability Fair Value	$ 2	$ 2

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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