Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 14,703	$ 14,416	$ 13,268
Net change	(789)	508	654
Ending balance	17,050	14,703	14,416
Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(1,017)	(2)
Ending balance			(1,017)
Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		13,399	13,266
Ending balance			13,399
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	631	123	(539)
Ending balance	(158)	631	123
Accumulated other comprehensive (loss) income | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			8
Accumulated other comprehensive (loss) income | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		123	(531)
Ending balance			123
Accumulated other comprehensive (loss) income | Accounting Standards Update 2017-08 | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			8
Unrealized gains on investment securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	640	208	(481)
Net change	(735)	432	681
Ending balance	(95)	640	208
Unrealized gains on investment securities | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(473)
Unrealized gains on investment securities | Accounting Standards Update 2017-08 | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			8
Translation adjustments and net investment hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	19	19	18
Net change	0	0	1
Ending balance	19	19	19
Translation adjustments and net investment hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			18
Translation adjustments and net investment hedges | Accounting Standards Update 2017-08 | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			0
Cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	82	2	19
Net change	(47)	80	(17)
Ending balance	35	82	2
Cash flow hedges | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			19
Cash flow hedges | Accounting Standards Update 2017-08 | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			0
Defined benefit pension plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(110)	(106)	(95)
Net change	(7)	(4)	(11)
Ending balance	$ (117)	$ (110)	(106)
Defined benefit pension plans | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(95)
Defined benefit pension plans | Accounting Standards Update 2017-08 | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 0