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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal
Current	$ (105)	$ 1,128	$ 1,661
Deferred	645	444	(378)
Foreign
Current	66	(74)	22
Deferred	(84)	42	80
State and local
Current	(24)	227	274
Deferred	49	(3)	(5)
Income tax expense	$ 547	$ 1,764	$ 1,654

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