Supplemental Disclosures of Cash Flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Disclosures of Cash Flow Data [Abstract]
Interest paid	$ 152	$ 154	$ 123
Income taxes paid (received)	245	192	215
Significant non-cash investing and financing transactions:
Reduction of other assets in connection with the expiration of an affiliate repurchase agreement	(150)
Acquisition of note receivable from affiliate	392	31	74
Investments received in financing transactions		263
Carrying value of asset, Exchanges of surplus note for promissory note with affiliate	40	58	109
Carrying value of liability, Exchange of surplus note for promissory note with affiliate	(40)	(58)	(109)
Net asset (liability) from exchange