Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings (loss) from continuing operations before income taxes and equity in loss of investee companies [Abstract]
United States	$ 1,599	$ 1,790	$ 2,283
Foreign	424	374	382
Earnings from continuing operations before income taxes and equity in loss of investee companies	2,023	2,164	2,665
Components of provision (benefit) for income taxes [Abstract]
Current federal income tax provision (benefit)	227	(14)	310
Current state and local income tax provision	54	22	74
Current foreign income tax provision	91	62	61
Total current income tax expense provision	372	70	445
Deferred tax provision	215	692	433
Provision for income taxes	587	762	878
Provision for income taxes for discontinued operations	7	26	6
Tax benefit relating to losses from equity investments	$ 21	$ 31	$ 30
Effective tax rate on equity investments	38.70%	38.70%	38.80%
Income tax benefit realized from stock option exercises and RSU vests	$ 155	$ 322