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Changes in Capital Structure - Schedule of Repurchases Under Share Repurchase Programs (Details) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,062,783
Capital Allocation Plan, Open Market Repurchases
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,062,783
Amounts paid for shares purchased | $	$ 197
Equivalent Shares In Lieu Of Tax Withholding on Equity Compensation Issuances
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	710,474
Average price paid per share (in usd per share) | $ / shares	$ 38.24
Amounts paid for shares purchased | $	$ 27
Capital Allocation Plan
Schedule of Capitalization, Equity [Line Items]
Total number of shares purchased (in shares)	6,773,257
Average price paid per share (in usd per share) | $ / shares	$ 33.05
Amounts paid for shares purchased | $	$ 224

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