Condensed Consolidated Statement of Changes in Equity - USD ($) $ in Millions	Total	Common stock and paid-in capital [Member]	Retained Earnings [Member]	Accumulated other comprehensive (loss) income [Member]	Treasury stock [Member]
Dividends Payable, Amount Per Share	$ 0.08
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stockholders' Equity Attributable to Parent, Total	$ 13,317	$ 21,166	$ (7,151)		$ (357)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(341)			$ (341)
Net Income (Loss) Attributable to Parent	214		214
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	21	21
Other Comprehensive Income (Loss), Net of Tax	20			20
Treasury Stock, Value, Acquired, Cost Method	(169)				(169)
Dividends, Common Stock, Cash	$ (38)		(38)
Dividends Payable, Amount Per Share	$ 0.08
Stockholders' Equity Attributable to Parent, Total	$ 13,365	21,187	(6,975)		(526)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (321)			(321)
Dividends Payable, Amount Per Share	$ 0.12
Stockholders' Equity Attributable to Parent, Total	$ 13,494	21,245	(6,406)		(1,110)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(235)			(235)
Net Income (Loss) Attributable to Parent	250		250
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	28	28
Other Comprehensive Income (Loss), Net of Tax	(328)			(328)
Treasury Stock, Value, Acquired, Cost Method	(185)				(185)
Dividends, Common Stock, Cash	$ (58)		(58)
Dividends Payable, Amount Per Share	$ 0.13
Stockholders' Equity Attributable to Parent, Total	$ 13,082	$ 21,273	$ (6,318)		$ (1,295)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(578)			$ (578)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member]	(126)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	(20)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]	$ 42