Comprehensive Income And Accumulated Other Comprehensive Loss - Changes in Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 1,569
Ending balance	$ 2,186		2,186
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(440)	$ (554)	(432)	$ (439)
Other comprehensive income/(loss) before reclassifications	7	11	(3)	(106)
Amounts reclassified from AOCL	8	1	10	3
Other comprehensive income/(loss)	15	12	7	(103)
Ending balance	(425)	(542)	(425)	(542)
Pension and Other Retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(116)	(92)	(118)	(92)
Other comprehensive income/(loss) before reclassifications	0	7	0	6
Amounts reclassified from AOCL	8	1	10	2
Other comprehensive income/(loss)	8	8	10	8
Ending balance	(108)	(84)	(108)	(84)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(48)	(35)	(49)	0
Other comprehensive income/(loss) before reclassifications	0	(14)	0	(50)
Amounts reclassified from AOCL	0	0	1	1
Other comprehensive income/(loss)	0	(14)	1	(49)
Ending balance	(48)	(49)	(48)	(49)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(188)	(570)	(45)	(401)
Other comprehensive income/(loss) before reclassifications	36	91	(107)	(78)
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income/(loss)	36	91	(107)	(78)
Ending balance	(152)	(479)	(152)	(479)
Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(88)	143	(220)	54
Other comprehensive income/(loss) before reclassifications	(29)	(73)	104	16
Amounts reclassified from AOCL	0	0	(1)	0
Other comprehensive income/(loss)	(29)	(73)	103	16
Ending balance	$ (117)	$ 70	$ (117)	$ 70