Consolidated Statements of Changes in Equity and Redeemable Non-Controlling Interest - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interest in Consolidated Subsidiaries
Beginning balance (in shares) at Dec. 31, 2016		596,000,000	(1,000,000)
Beginning balance at Dec. 31, 2016	$ 15,775	$ 6	$ (40)	$ 11,306	$ 4,810	$ (344)	$ 37
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	$ 121					121
Exercise of common stock options (in shares)	597,000
Exercise of common stock options	$ 17			17
Repurchases of common stock (in shares)	(14,967,000)		(15,000,000)
Repurchases of common stock	$ (949)		$ (949)
Payments relating to treasury shares (in shares)	(1,500,000)		(1,000,000)
Payments relating to treasury shares	$ (88)		$ (88)
Stock-based compensation	152			152
Issuance of restricted stock (in shares)		4,000,000
Issuance of restricted stock	0		$ 1	(1)
Acquisition of non-controlling interest	(92)			(82)			(10)
Distributions of profits	(26)						(26)
Dividends paid to stockholders	(476)				(476)
Redeemable non-controlling interest	(2)				(2)
Net income attributable to non-controlling interest	(1)				(28)		27
Net income	2,554				2,554
Ending balance (in shares) at Dec. 31, 2017		600,000,000	(17,000,000)
Ending balance at Dec. 31, 2017	16,985	$ 6	$ (1,076)	11,392	6,858	(223)	28
Redeemable non-controlling interest, Beginning balance at Dec. 31, 2016	36
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable non-controlling interest	(37)
Net income attributable to non-controlling interest	1
Redeemable non-controlling interest, Ending balance at Dec. 31, 2017	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	(92)					(92)
Other comprehensive loss	$ (66)					(66)
Exercise of common stock options (in shares)	908,000	1,000,000
Exercise of common stock options	$ 32			32
Repurchases of common stock (in shares)	(16,257,000)		(16,000,000)
Repurchases of common stock	$ (1,198)		$ (1,198)
Payments relating to treasury shares (in shares)	(1,500,000)		(2,000,000)
Payments relating to treasury shares	$ (80)		$ (80)
Stock-based compensation	146			146
Issuance of restricted stock (in shares)		3,000,000
Issuance of restricted stock	0
Acquisition of non-controlling interest	(25)			(23)	0		(2)
Distributions of profits	(28)						(28)
Dividends paid to stockholders	(555)				(555)
Net income attributable to non-controlling interest	0				(32)		32
Impact of adoption of ASU 2018-02 to reclassify items stranded in other comprehensive income	0				26	(26)
Net income	$ 2,020				2,020
Ending balance (in shares) at Dec. 31, 2018	604,000,000	604,000,000	(35,000,000)
Ending balance at Dec. 31, 2018	$ 17,231	$ 6	$ (2,354)	11,547	8,317	(315)	30
Increase (Decrease) in Temporary Equity [Roll Forward]
Redeemable non-controlling interest	71
Redeemable non-controlling interest, Ending balance at Dec. 31, 2018	71
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	$ 72					72
Exercise of common stock options (in shares)	598,000	1,000,000
Exercise of common stock options	$ 23			23
Repurchases of common stock (in shares)	(17,432,000)		(17,000,000)
Repurchases of common stock	$ (1,460)		$ (1,460)
Payments relating to treasury shares (in shares)	(1,000,000.0)		(1,000,000)
Payments relating to treasury shares	$ (65)		$ (65)
Stock-based compensation	143			143
Issuance under the employee stock purchase plan	29			29
Issuance of restricted stock (in shares)		2,000,000
Issuance of restricted stock	0
Distributions of profits	(29)						(29)
Dividends paid to stockholders	(621)				(621)
Net income attributable to non-controlling interest	3				(27)		30
Net income	$ 1,960				1,960
Ending balance (in shares) at Dec. 31, 2019	607,000,000	607,000,000	(53,000,000)
Ending balance at Dec. 31, 2019	$ 17,286	$ 6	$ (3,879)	$ 11,742	$ 9,629	$ (243)	$ 31
Increase (Decrease) in Temporary Equity [Roll Forward]
Stock-based compensation	11
Net income attributable to non-controlling interest	(4)
Redeemable non-controlling interest, Ending balance at Dec. 31, 2019	$ 78