Earnings Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	18,500,000	6,100,000
Aggregate authorized amount	$ 17,500,000,000.000
Shares repurchased under share repurchase program (in shares)	14,100,000
Shares repurchased under share repurchase program	$ 1,410,000,000
Remaining authorized repurchase amount under stock purchase program	$ 2,481,000,000
Purchased Put Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Put options outstanding (in shares)	0