Comprehensive Income And Accumulated Other Comprehensive Income - Changes in Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 612
Other comprehensive income/(loss) before reclassifications	(117)	$ (9)
Amounts reclassified from AOCI	2	0
Other comprehensive income/(loss)	(115)	(29)
Ending balance	582
Pension and Other Retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(92)	(53)
Other comprehensive income/(loss) before reclassifications	(1)	1
Amounts reclassified from AOCI	1	0
Other comprehensive income/(loss)	0	(16)
Ending balance	(92)	(69)
Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	0
Other comprehensive income/(loss) before reclassifications	(36)	0
Amounts reclassified from AOCI	1	0
Other comprehensive income/(loss)	(35)	0
Ending balance	(35)	0
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(401)	(406)
Other comprehensive income/(loss) before reclassifications	(169)	(34)
Amounts reclassified from AOCI	0	0
Other comprehensive income/(loss)	(169)	(34)
Ending balance	(570)	(440)
Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	54	33
Other comprehensive income/(loss) before reclassifications	89	24
Amounts reclassified from AOCI	0	0
Other comprehensive income/(loss)	89	21
Ending balance	143	54
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(439)	(426)
Ending balance	$ (554)	$ (455)
Accounting Standards Update 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			$ (20)
Accounting Standards Update 2018-02 | Pension and Other Retirement Benefits
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			(17)
Accounting Standards Update 2018-02 | Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			0
Accounting Standards Update 2018-02 | Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			0
Accounting Standards Update 2018-02 | Net Investment Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of new accounting principle in period of adoption			$ (3)