Equity and Comprehensive Earnings - AOCI Activity (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Accumulated Other Comprehensive Earnings (Loss)
Stockholders' Equity Attributable to Parent, Beginning Balance	$ 3,275
Stockholders' Equity Attributable to Parent, Ending Balance	3,492
Foreign Currency Translation
Accumulated Other Comprehensive Earnings (Loss)
Stockholders' Equity Attributable to Parent, Beginning Balance	(555)
Other comprehensive earnings (loss) before reclassifications	(12)
Stockholders' Equity Attributable to Parent, Ending Balance	(567)
Pension and Other Postretirement Benefits (Net of Tax)
Accumulated Other Comprehensive Earnings (Loss)
Stockholders' Equity Attributable to Parent, Beginning Balance	(466)
Other comprehensive earnings (loss) before reclassifications	21
Reclassification of net deferred (gains) losses into earnings	11
Stockholders' Equity Attributable to Parent, Ending Balance	(434)
Effective Derivatives (Net of Tax)
Accumulated Other Comprehensive Earnings (Loss)
Stockholders' Equity Attributable to Parent, Beginning Balance	67
Other comprehensive earnings (loss) before reclassifications	66
Reclassification of net deferred (gains) losses into earnings	(29)
Stockholders' Equity Attributable to Parent, Ending Balance	104
Accumulated Other Comprehensive Earnings (Loss).
Accumulated Other Comprehensive Earnings (Loss)
Stockholders' Equity Attributable to Parent, Beginning Balance	(954)
Other comprehensive earnings (loss) before reclassifications	75
Reclassification of net deferred (gains) losses into earnings	(18)
Stockholders' Equity Attributable to Parent, Ending Balance	$ (897)