Assets Subject to Netting (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Derivatives:
Gross Amounts of Recognized Assets		$ 6,120	$ 5,870
Amounts of Assets Presented in the Consolidated Balance Sheets		6,120	5,870
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(4,121)	(3,978)
Cash Collateral		(1,458)	(1,452)
Securities Collateral		(409)	(315)
Net Amount		132	125
Securities borrowed
Gross Amounts of Recognized Assets		107	147
Amounts of Assets Presented in the Consolidated Balance Sheets		107	147
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(36)	(43)
Securities Collateral		(69)	(103)
Net Amount		2	1
Total
Gross Amounts of Recognized Assets		6,227	6,017
Amounts of Assets Presented in the Consolidated Balance Sheets		6,227	6,017
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(4,157)	(4,021)
Cash Collateral		(1,458)	(1,452)
Securities Collateral		(478)	(418)
Net Amount		134	126
OTC
Derivatives:
Gross Amounts of Recognized Assets		5,688	5,501
Amounts of Assets Presented in the Consolidated Balance Sheets		5,688	5,501
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(3,970)	(3,862)
Cash Collateral		(1,260)	(1,287)
Securities Collateral		(409)	(315)
Net Amount		49	37
OTC cleared
Derivatives:
Gross Amounts of Recognized Assets		103	58
Amounts of Assets Presented in the Consolidated Balance Sheets		103	58
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(50)	(25)
Net Amount		53	33
Exchange-traded
Derivatives:
Gross Amounts of Recognized Assets		329	311
Amounts of Assets Presented in the Consolidated Balance Sheets		329	311
Gross Amounts Not Offset in the Consolidated Balance Sheets
Financial Instruments	[1]	(101)	(91)
Cash Collateral		(198)	(165)
Net Amount		$ 30	$ 55

[1] Represents the amount of assets that could be offset by liabilities with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.