Condensed Consolidated Statement of Changes in Equity - USD ($)	Total	Common stock and paid-in capital [Member]	Retained Earnings [Member]	Accumulated other comprehensive (loss) income [Member]	Treasury stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (341,000,000)			$ (341,000,000)
Stockholders' Equity Attributable to Parent, Total	13,317,000,000	$ 21,166,000,000	$ (7,151,000,000)		$ (357,000,000)
Dividends, Common Stock	0.16
Net Income (Loss) Attributable to Parent	466,000,000		466,000,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	42,000,000	42,000,000
Other Comprehensive Income (Loss), Net of Tax	96,000,000			96,000,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	96,000,000
Treasury Stock, Value, Acquired, Cost Method	(373,000,000)				(373,000,000)
Dividends, Common Stock, Cash	(75,000,000)		(75,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(245,000,000)			(245,000,000)
Stockholders' Equity Attributable to Parent, Total	13,473,000,000	21,208,000,000	(6,760,000,000)		(730,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(235,000,000)			(235,000,000)
Stockholders' Equity Attributable to Parent, Total	13,494,000,000	21,245,000,000	(6,406,000,000)		(1,110,000,000)
Dividends, Common Stock	0.26
Net Income (Loss) Attributable to Parent	599,000,000		599,000,000
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	58,000,000	58,000,000
Other Comprehensive Income (Loss), Net of Tax	(398,000,000)			(398,000,000)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(398,000,000)
Treasury Stock, Value, Acquired, Cost Method	(380,000,000)				(380,000,000)
Dividends, Common Stock, Cash	(115,000,000)		(115,000,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(648,000,000)			$ (648,000,000)
Stockholders' Equity Attributable to Parent, Total	13,139,000,000	$ 21,303,000,000	$ (6,026,000,000)		$ (1,490,000,000)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 [Member]	(126,000,000)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2016-01 [Member]	(20,000,000)
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2018-02 [Member]	$ 42,000,000