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Shareholders' Equity - Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 24,737 $ 22,270 $ 21,193
Other comprehensive income (loss) before reclassifications 569 (398)  
Reclassification of certain tax effects (84)    
Amounts reclassified into (out of) earnings (5) 51  
Other comprehensive income (loss) 564 (347) 1,031
Other comprehensive income (loss) 480    
Ending balance 24,431 24,737 22,270
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (1,356) (1,009) (2,040)
Reclassification of certain tax effects [1] (84)    
Other comprehensive income (loss) 564 (347) 1,031
Ending balance (876) (1,356) (1,009)
Net Unrealized Gains (Losses) on Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (89) (56)  
Other comprehensive income (loss) before reclassifications 13 (52)  
Reclassification of certain tax effects (6)    
Amounts reclassified into (out of) earnings 12 19  
Other comprehensive income (loss)   (33)  
Other comprehensive income (loss) 19    
Ending balance (70) (89) (56)
Net Unrealized Gains (Losses) on Available-for-Sale Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (175) 103  
Other comprehensive income (loss) before reclassifications 563 (285)  
Reclassification of certain tax effects 21    
Amounts reclassified into (out of) earnings 0 7  
Other comprehensive income (loss)   (278)  
Other comprehensive income (loss) 584    
Ending balance 409 (175) 103
Net Unrealized Losses on Hedges of Net Investments in Non-U.S. Subsidiaries      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 16 (65)  
Other comprehensive income (loss) before reclassifications 33 81  
Reclassification of certain tax effects (3)    
Amounts reclassified into (out of) earnings 0 0  
Other comprehensive income (loss)   81  
Other comprehensive income (loss) 30    
Ending balance 46 16 (65)
Other-Than-Temporary Impairment on Held-to-Maturity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (2) (6)  
Other comprehensive income (loss) before reclassifications 2 6  
Reclassification of certain tax effects (1)    
Amounts reclassified into (out of) earnings (1) (2)  
Other comprehensive income (loss)   4  
Other comprehensive income (loss) 0    
Ending balance (2) (2) (6)
Net Unrealized Losses on Retirement Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (143) (170)  
Other comprehensive income (loss) before reclassifications 0 0  
Reclassification of certain tax effects (28)    
Amounts reclassified into (out of) earnings (16) 27  
Other comprehensive income (loss)   27  
Other comprehensive income (loss) (44)    
Ending balance (187) (143) (170)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance (963) (815)  
Other comprehensive income (loss) before reclassifications (42) (148)  
Reclassification of certain tax effects (67)    
Amounts reclassified into (out of) earnings 0 0  
Other comprehensive income (loss)   (148)  
Other comprehensive income (loss) (109)    
Ending balance $ (1,072) $ (963) $ (815)
[1] Represents the reclassification from accumulated other comprehensive income into retained earnings as a result of our adoption of ASU 2018-02 - Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2019