Income Taxes - Income tax activity and implications of settlement (Details) - Internal Revenue Service (IRS) - Approval of 1998 To 2008 tax years final settlement $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($)
Income Taxes
Income tax benefit on continuing and discontinued operations	$ 319
Continuing Operations
Income Taxes
Income tax benefit on continuing operations	206
Discontinued Operations
Income Taxes
Income tax benefit on discontinued operations	$ 113

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