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Equity - AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	$ 2,388
Balance at the end of the period	2,522
Cumulative Translation Adjustment
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	(1,080)	$ (951)
Other comprehensive (loss) income before reclassification adjustments	1	21
Net other comprehensive income (loss)	1	21
Balance at the end of the period	(1,079)	(930)
(Loss) Gain on Hedging Activities, ASU 2017-12
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	(5)
Other comprehensive (loss) income before reclassification adjustments	(12)
Amount reclassified from accumulated OCI	2
Tax (provision) benefit	3
Net other comprehensive income (loss)	(7)
Balance at the end of the period	(12)
(Loss) Gain on Hedging Activities
Accumulated Other Comprehensive Loss
Balance at the beginning of the period		(13)
Other comprehensive (loss) income before reclassification adjustments		22
Amount reclassified from accumulated OCI		4
Tax (provision) benefit		(6)
Net other comprehensive income (loss)		20
Balance at the end of the period		7
Pension and other postretirement plans
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	(69)	(51)
Other comprehensive (loss) income before reclassification adjustments		(1)
Net other comprehensive income (loss)		(1)
Balance at the end of the period	(69)	(52)
Unrealized (Loss) Gain on Investment
Accumulated Other Comprehensive Loss
Balance at the beginning of the period		2
Other comprehensive (loss) income before reclassification adjustments		1
Net other comprehensive income (loss)		1
Balance at the end of the period		3
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Balance at the beginning of the period	(1,154)	(1,013)
Other comprehensive (loss) income before reclassification adjustments	(11)	43
Amount reclassified from accumulated OCI	2	4
Tax (provision) benefit	3	(6)
Net other comprehensive income (loss)	(6)	41
Balance at the end of the period	$ (1,160)	$ (972)

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