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(Loss) Earnings Per Share - Computed Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net (loss) income	$ (373)	$ (393)	$ (320)	$ (268)	$ 161	$ 187	$ 179	$ 42	$ (1,354)	$ 569	$ 189
Weighted average basic shares (in shares)									277.5	296.6	312.9
Effect of dilutive securities (in shares)									2.0	1.8	1.6
Weighted average diluted shares									279.5	298.4	314.5
Basic (in dollars per share)	$ (1.31)	$ (1.44)	$ (1.18)	$ (0.97)	$ 0.56	$ 0.63	$ 0.60	$ 0.14	$ (4.88)	$ 1.92	$ 0.60
Diluted (in dollars per share)					$ 0.56	$ 0.63	$ 0.59	$ 0.14	$ (4.88)	$ 1.91	$ 0.60

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