Earnings Per Share (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	19,200,000	9,000,000	19,700,000	9,000,000
Authorized repurchase share amount, increase	$ 3,000,000,000.000		$ 3,000,000,000.000
Aggregate authorized amount	$ 20,500,000,000.000		$ 20,500,000,000.000
Shares repurchased under share repurchase program (in shares)	3,400,000		17,500,000
Shares repurchased under share repurchase program	$ 343,100,000		$ 1,753,000,000
Remaining authorized repurchase amount under stock purchase program	$ 5,138,000,000		$ 5,138,000,000
Purchased Put Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Put options outstanding (in shares)	0		0