Equity - Statements of Equity with dividends per share (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Balance at beginning of period		$ 3,118			$ 3,118
Balance at end of period	$ 3,161				3,161
Common Stock
Balance at beginning of period	1	1	$ 1	$ 1	1	$ 1
Balance at end of period	1	1	1	1	1	1
Additional Paid-in Capital
Balance at beginning of period	1,160	1,158	1,155	1,150	1,158	1,150
Share-based compensation, net of issuance	2	2	(1)	5	4	4
Fair market value adjustment to non-controlling interests	(29)				(29)
Balance at end of period	1,133	1,160	1,154	1,155	1,133	1,154
Treasury Stock, Common
Balance at beginning of period	(1,091)	(1,061)	(1,022)	(1,024)	(1,061)	(1,024)
Repurchases of common stock	(44)	(39)	(10)	(14)	(83)	(24)
Share-based compensation, net of issuance	2	9	3	16	11	19
Balance at end of period	(1,133)	(1,091)	(1,029)	(1,022)	(1,133)	(1,029)
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period	(763)	(897)	(1,164)	(1,133)	(897)	(1,133)
Other comprehensive income (loss)	(177)	134	58	(31)	(43)	27
Balance at end of period	(940)	(763)	(1,106)	(1,164)	(940)	(1,106)
Retained Earnings
Balance at beginning of period	3,986	3,899	3,667	3,957	3,899	3,957
Net income (loss)	142	130	178	(246)	272	(68)
Dividends declared, common stock	(43)	(43)	(43)	(44)	(86)	(87)
Balance at end of period	4,085	3,986	3,802	3,667	4,085	3,802
Noncontrolling Interest
Balance at beginning of period	19	18	26	21	18	21
Net income (loss)	2	3	3	4	5	7
Dividends declared, common stock	(4)		(7)		(4)	(7)
Other comprehensive income (loss)	(2)	(2)		1	(4)	1
Balance at end of period	$ 15	$ 19	$ 22	$ 26	$ 15	$ 22