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Accumulated Other Comprehensive Loss and Shareholders' Equity - Changes in Shareholders' Equity (Deficit) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019	Dec. 31, 2018	Jan. 01, 2018
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	$ 1,240	$ 1,603	$ 2,225	$ 2,920	$ 3,588	$ 3,731	$ 2,225	$ 3,731
Balance at beginning of period (as adjusted)	838						838			$ 2,225
Net income	387	232	375	503	667	420	994	1,590
Other comprehensive income (loss)	(178)	34	31	(65)	(385)	162	(113)	(288)
Dividends	(157)	(159)	(139)	(141)	(145)	(118)
Share-based compensation plans	46	30	(62)	47	45	(48)
Purchase of treasury stock	(500)	(500)	(828)	(841)	(850)	(782)
Balance at end of period	$ 838	$ 1,240	$ 1,603	$ 2,423	$ 2,920	$ 3,588	838	2,423
Cash dividends (in USD per share)	$ 0.48	$ 0.41	$ 0.33	$ 0.41	$ 0.48	$ 0.41
Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5
Balance at beginning of period (in shares)	330.6	334.1	339.1	348.7	354.8	359.1	339.1	359.1
Share-based compensation plans (in shares)	0.1	0.2	1.7	0.0	0.1	1.3
Purchase of treasury stock (in shares)	(3.8)	(3.7)	(6.7)	(6.7)	(6.2)	(5.6)
Balance at end of period	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5	$ 5
Balance at end of period (in shares)	326.9	330.6	334.1	342.0	348.7	354.8	326.9	342.0
Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	$ 5,729	$ 5,706	$ 5,814	$ 5,728	$ 5,685	$ 5,770	$ 5,814	$ 5,770
Share-based compensation plans	44	23	(108)	45	43	(85)
Balance at end of period	5,773	5,729	5,706	5,773	5,728	5,685	5,773	5,773
Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	9,292	9,219	8,982	8,442	7,920	7,391	8,982	7,391
Net income		232	375	503	667	420
Dividends	(157)	(159)	(139)	(141)	(145)	(118)
Balance at end of period	9,522	9,292	9,219	8,804	8,442	7,920	9,522	8,804
Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	(13,460)	(12,967)	(12,185)	(11,011)	(10,163)	(9,418)	(12,185)	(9,418)
Share-based compensation plans	2	7	46	2	2	37
Purchase of treasury stock	(500)	(500)	(828)	(841)	(850)	(782)
Balance at end of period	(13,958)	(13,460)	(12,967)	(11,850)	(11,011)	(10,163)	(13,958)	(11,850)
Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period	(326)	(360)	(391)	(244)	141	(17)	(391)	(17)
Other comprehensive income (loss)	(178)	34	31	(65)	(385)	162
Balance at end of period	$ (504)	$ (326)	$ (360)	$ (309)	$ (244)	$ 141	$ (504)	$ (309)
Adoption of ASU 2016-02
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									$ 1
Adoption of ASU 2016-02 \| Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									0
Adoption of ASU 2016-02 \| Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									0
Adoption of ASU 2016-02 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									1
Adoption of ASU 2016-02 \| Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									0
Adoption of ASU 2016-02 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU									$ 0
Adoption of ASU 2014-09
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											$ (149)
Balance at beginning of period (as adjusted)											3,582
Adoption of ASU 2014-09 \| Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Balance at beginning of period (in shares)						359.1		359.1
Adoption of ASU											0
Balance at beginning of period (as adjusted)											5
Adoption of ASU 2014-09 \| Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Balance at beginning of period (as adjusted)											5,770
Adoption of ASU 2014-09 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											(149)
Balance at beginning of period (as adjusted)											7,242
Adoption of ASU 2014-09 \| Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Balance at beginning of period (as adjusted)											(9,418)
Adoption of ASU 2014-09 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Balance at beginning of period (as adjusted)											(17)
Adoption of ASU 2016-01
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-01 \| Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-01 \| Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-01 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											4
Adoption of ASU 2016-01 \| Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-01 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											(4)
Adoption of ASU 2016-16
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											372
Adoption of ASU 2016-16 \| Class A Common Stock
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-16 \| Additional Paid-in- Capital
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-16 \| Retained Earnings
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											372
Adoption of ASU 2016-16 \| Treasury Stock, at Cost
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											0
Adoption of ASU 2016-16 \| Accumulated Other Comprehensive Loss
(Increase) Decrease in Shareholders' Deficit [Roll Forward]
Adoption of ASU											$ 0