Share-based Incentive Compensation Plans - Compensation Cost (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 97	$ 97	$ 118
Income tax benefit	29	18	39
Share-based compensation expense	68	79	79
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	45	49	57
Unrecognized compensation cost	$ 22
Expected remaining weighted-average period of expense recognition (in years)	1 year 8 months 12 days
PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 44	43	44
Unrecognized compensation cost	$ 32
Expected remaining weighted-average period of expense recognition (in years)	1 year 7 months 6 days
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 8	5	16
Unrecognized compensation cost	$ 6
Expected remaining weighted-average period of expense recognition (in years)	1 year 4 months 24 days
Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 0	$ 0	$ 1

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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