Shareholders' Equity - Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	$ 13,794	$ 13,598
Balance at end of period	15,004	13,800
Accumulated Other Comprehensive Income (Loss)
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(1,273)	(1,309)
Balance at end of period	(1,034)	(1,332)
Unrealized gain (loss) on hedges
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(77)	(157)
Other comprehensive income (loss), net of tax	95	49
Balance at end of period	19	(108)
Defined benefit plans
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	1	1
Other comprehensive income (loss), net of tax	0	0
Balance at end of period	0	1
Foreign currency translation adjustment
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance at beginning of period	(1,197)	(1,153)
Other comprehensive income (loss), net of tax	144	(72)
Balance at end of period	$ (1,053)	$ (1,225)