Derivative Financial Instruments - Offsetting Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets and liabilities [Line Items]
Asset Fair Value	$ 128	$ 136
Liability Fair Value	99	85
Counterparty netting, Assets	(88)	(50)
Counterparty netting, Liabilities	(88)	(50)
Cash collateral netting, Assets	(37)	(84)
Cash collateral netting, Liabilities	(2)	0
Securities collateral netting, Assets	0	0
Securities collateral netting, Liabilities	(9)	(30)
Net receivables	3	2
Net payables	0	5
Equity contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	98	154
Asset Fair Value	1	9
Liability Fair Value	1	7
Foreign exchange contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	632	559
Asset Fair Value	10	0
Liability Fair Value	20	52
Interest rate contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	17,478	17,286
Asset Fair Value	117	117
Liability Fair Value	76	20
Credit contracts
Offsetting Assets and liabilities [Line Items]
Notional Amount	201	771
Asset Fair Value	0	10
Liability Fair Value	$ 2	$ 6

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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