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Discontinued Operations and Business Dispositions - Summary (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2018	Dec. 31, 2017	Sep. 30, 2016
Financial information for discontinued operations
Income tax benefits		$ 39	$ 109
Dispositions held for sale \| AMO
Gain on disposal of discontinued operations, net of tax
Sale consideration				$ 4,325
After tax gain			728
Loss before tax			$ 18
Dispositions held for sale \| AMO \| Other (income) expense, net
Gain on disposal of discontinued operations, net of tax
Pretax gain	$ 1,163