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New Accounting Pronouncements New Accounting Pronouncements - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income	$ 1,457	$ 1,530	$ 4,440	$ 4,638
Reclassification of income	$ (6)	(1)	$ (21)	14
Prepaid taxes					$ 105
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of income		6		42
Reclassification of income		$ 6		$ 42