Consolidated Statements Of Shareholders' Equity (USD $) In Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Net Unrealized Investment Gain (Loss) [Member]	Accumulated Translation Adjustment [Member]	Accumulated Defined Benefit Plans Adjustment [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance - beginning of period at Dec. 31, 2012		$ 9,591	$ (159)	$ 5,179	$ 10,033	$ 2,633	$ 339	$ (85)
Dividends declared on Common Shares – par value reduction		(518)
Common Shares repurchased			(233)
Net shares redeemed under employee share-based compensation plans			170	(129)
Exercise of stock options				(34)
Share-based compensation expense and other				184
Funding of dividends declared to Retained earnings				0
Net income	2,760				2,760
Funding of dividends declared from Additional paid-in capital					0
Dividends declared on Common Shares					0
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(168) and 337						(1,233)
Amounts reclassified from AOCI, net of income tax benefit of $7 and $16						(81)
Change in period, net of income tax (expense) benefit of $(161) and $353						(1,314)
Change in period, net of income tax benefit of $7 and $27							(210)
Change in period, net of income tax (expense) benefit of $3 and $(6)								11
Balance - end of period at Sep. 30, 2013	28,218	9,073	(222)	5,200	12,793	1,319	129	(74)	1,374
Balance - beginning of period at Dec. 31, 2013	28,825	8,899	(255)	5,238	13,791	1,174	63	(85)
Dividends declared on Common Shares – par value reduction		(621)
Common Shares repurchased			(1,019)
Net shares redeemed under employee share-based compensation plans			217	(167)
Exercise of stock options				(44)
Share-based compensation expense and other				153
Funding of dividends declared to Retained earnings				(81)
Net income	2,298				2,298
Funding of dividends declared from Additional paid-in capital					81
Dividends declared on Common Shares					(81)
Change in period, before reclassification from AOCI, net of income tax (expense) benefit of $(168) and 337						565
Amounts reclassified from AOCI, net of income tax benefit of $7 and $16						18
Change in period, net of income tax (expense) benefit of $(161) and $353						583
Change in period, net of income tax benefit of $7 and $27							(124)
Change in period, net of income tax (expense) benefit of $3 and $(6)								(3)
Balance - end of period at Sep. 30, 2014	$ 30,017	$ 8,278	$ (1,057)	$ 5,099	$ 16,089	$ 1,757	$ (61)	$ (88)	$ 1,608