Changes in Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Mar. 01, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		$ 14	$ 38	$ 188	$ (54)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(13)	(19)	(157)	(65)
Total other comprehensive income (loss)		1	20	31	(119)
Accumulated Other Comprehensive Income (Loss), Net of Tax		238	151	238	151	$ 237	$ 207	$ 131	$ 270
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		(47)	88	5	(90)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		(2)	(5)	(135)	(14)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		(49)	84	(130)	(104)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		88	38	88	38	136	218	(46)	142
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		61	(50)	182	36
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		(11)	(14)	(21)	(52)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		50	(64)	161	(15)
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		196	158	196	158	146	36	222	173
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax		0	0	1	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax		0	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax		0	0	1	0
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		$ (46)	$ (45)	$ (46)	$ (45)	$ (46)	$ (47)	$ (45)	$ (45)
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations | Specialty Pharmaceuticals [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	$ (127)