Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Common stock and paid-in capital	Accumulated Deficit	Accumulated other comprehensive (loss) income	Treasury stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity	$ 13,268	$ 21,345	$ (5,489)	$ (539)	$ (2,049)
Common stock dividends, amount per share	$ 0.34
Net income (loss)	$ 956		956
Share-based compensation	58	58
Other comprehensive income	(615)			(615)
Common stock repurchases	(440)				(440)
Common stock dividends	(139)		(139)
Equity	$ 13,699	21,379	(5,195)	(225)	(2,260)
Common stock dividends, amount per share	$ 0.17
Net income (loss)	$ 582		582
Share-based compensation	24	24
Other comprehensive income	(309)			(309)
Common stock repurchases	(229)				(229)
Common stock dividends	(69)		(69)
Equity	14,316	21,403	(4,682)	84	(2,489)
Equity	$ 14,416	21,438	(4,057)	123	(3,088)
Common stock dividends, amount per share	$ 0.38
Net income (loss)	$ (78)		(78)
Share-based compensation	61	61
Other comprehensive income	(692)			(692)
Common stock repurchases	(104)				(104)
Common stock dividends	(144)		(144)
Equity	$ 13,519	21,470	(5,465)	706	(3,192)
Common stock dividends, amount per share	$ 0.19
Net income (loss)	$ 241		241
Share-based compensation	29	29
Other comprehensive income	(109)			(109)
Common stock dividends	(72)		(72)
Equity	$ 13,826	$ 21,499	$ (5,296)	$ 815	$ (3,192)