Stockholders' Equity and EPS - Activity Related to Net Gains on Cash Flow Hedges in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cash flow hedge gains expected to reclassified out of AOCI over next 12 months			$ 49
Balance, beginning of period, net of tax	$ 16,360	$ 10,121	16,609	$ 8,433
Balance, end of period, net of tax	16,276	11,967	16,276	11,967
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period, net of tax	72	118	83	129
Net realized (gain) loss reclassified to net income, net of tax	(10)	(11)	(21)	(22)
Balance, end of period, net of tax	$ 62	$ 107	$ 62	$ 107