Equity - Accumulated Other Comprehensive Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	$ 20,342	$ 19,961
Other comprehensive income (loss), net of tax	49	(4)
Balance, end of period	20,510	20,060
Gain for defined benefit plans, income tax expense	0	3
Amortization of pension cost, income tax expense	0	0
Unrealized (loss) gain from equity method investment, income tax expense	0	5
Unrealized loss during period on derivatives qualifying as cash flow hedges, income tax benefit	(1)	(15)
Reclassification to net income of loss on cash flow hedges, income taxes	18	4
Gain for defined benefit plans, net of income tax expense
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), net of tax	0	8
Amortization of pension cost, net of income tax expense
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Other comprehensive income (loss), net of tax	0	1
Net (loss) gain on pension plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(20)	(38)
Other comprehensive income (loss), net of tax	0	9
Balance, end of period	(20)	(29)
Unrealized (loss) gain from equity method investment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	13	(9)
Other comprehensive income (loss), net of tax	(1)	15
Balance, end of period	12	6
Unrealized loss during period on derivatives qualifying as cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(195)	(194)
Other comprehensive income (loss), net of tax	(2)	(39)
Balance, end of period	(197)	(233)
Reclassification to net income of losses on cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	22	(32)
Other comprehensive income (loss), net of tax	52	11
Balance, end of period	74	(21)
Loss (gain) on derivatives qualifying as cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(173)	(226)
Other comprehensive income (loss), net of tax	50	(28)
Balance, end of period	(123)	(254)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period	(180)	(273)
Other comprehensive income (loss), net of tax	49	(4)
Balance, end of period	$ (131)	$ (277)