Changes in Other Comprehensive Income (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Mar. 01, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		$ (8)	$ (12)	$ 174	$ (92)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		(9)	(25)	(144)	(47)
Total other comprehensive income (loss)		(16)	(37)	30	(139)
Accumulated Other Comprehensive Income (Loss), Net of Tax		237	131	237	131	$ 254	$ 207	$ 168	$ 270
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax		5	(6)	53	(178)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax		(3)	(5)	(134)	(9)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax		2	(11)	(81)	(187)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax		136	(46)	136	(46)	134	218	(35)	142
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax		(12)	(6)	121	86
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax		(6)	(20)	(10)	(37)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax		(18)	(26)	111	48
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax		146	222	146	222	165	36	248	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)	$ (45)	$ (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)