CONSOLIDATED STATEMENTS OF CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Balance, beginning of period	$ 13,195	$ 12,002	$ 10,958
Changes in Accumulated Other Comprehensive Income/(Loss)
Total period activity	15	97	(260)
Balance, end of period	9,738	13,195	12,002
Derivative Instruments
Balance, beginning of period	(259)	(177)	(223)
Changes in Accumulated Other Comprehensive Income/(Loss)
Reclassification adjustments	11	9	8
Unrealized gain/(loss) on hedges	(10)	(91)	38
Total period activity	1	(82)	46
Balance, end of period	(258)	(259)	(177)
Translation Adjustments
Balance, beginning of period	(674)	(853)	(548)
Changes in Accumulated Other Comprehensive Income/(Loss)
Currency translation adjustments	17	179	(305)
Total period activity	17	179	(305)
Balance, end of period	(657)	(674)	(853)
Other
Balance, beginning of period			1
Changes in Accumulated Other Comprehensive Income/(Loss)
Other	(3)		(1)
Total period activity	(3)		(1)
Balance, end of period	(3)
Total
Balance, beginning of period	(933)	(1,030)	(770)
Changes in Accumulated Other Comprehensive Income/(Loss)
Reclassification adjustments	11	9	8
Unrealized gain/(loss) on hedges	(10)	(91)	38
Currency translation adjustments	17	179	(305)
Other	(3)		(1)
Total period activity	15	97	(260)
Balance, end of period	$ (918)	$ (933)	$ (1,030)