Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income/(Loss) (net of tax)
Balance at the beginning of the period	$ 2,445	$ 3,164	$ 2,686	$ 3,420
Other comprehensive income/(loss), net of tax	52	19	(121)	25
Balance at the end of the period	2,343	2,724	2,343	2,724
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income/(Loss) (net of tax)
Balance at the beginning of the period	(204)	(27)	(31)	(33)
Other comprehensive income before reclassification			(123)	24
Amount reclassified from accumulated other comprehensive income			1	1
Other comprehensive income/(loss), net of tax	52	19	(121)	25
Balance at the end of the period	(153)	(8)	(153)	(8)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income/(Loss) (net of tax)
Balance at the beginning of the period			(12)	(23)
Other comprehensive income before reclassification			(123)	25
Other comprehensive income/(loss), net of tax	51	19	(123)	25
Balance at the end of the period	(135)	1	(135)	1
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income/(Loss) (net of tax)
Balance at the beginning of the period			(19)	(10)
Other comprehensive income before reclassification			0	0
Amount reclassified from accumulated other comprehensive income			1	1
Other comprehensive income/(loss), net of tax	1	0	2	0
Balance at the end of the period	$ (17)	$ (9)	$ (17)	$ (9)