v3.19.3.a.u2
Income Taxes (Changes In Unrecognized Tax Benefits Balance For Federal State And Foreign Tax) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Abstract]    
Balance at beginning of year $ 10,358 $ 7,648
Increases for tax positions related to the current year 903 336
Increases for tax positions related to prior years 1,106 2,615
Decreases for tax positions related to prior years (1,283) (394)
Lapse of statute of limitations (32) (52)
Settlements (283) (664)
Current year acquisitions 205 872
Increase Resulting from Foreign Currency Translation 5  
Decrease resulting from foreign currency effects   (3)
Balance at end of year 10,979 10,358
Accrued interest and penalties 2,708 2,588
Gross unrecognized income tax benefits 13,687 12,946
Less: Deferred federal and state income tax benefits (886) (811)
Less: Tax attributable to timing items included above (4,320) (3,430)
Less: UTBs included above that relate to acquired entities that would impact goodwill if recognized 0 (918)
Total UTB that, if recognized, would impact the effective income tax rate as of the end of the year $ 8,481 $ 7,787