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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in cash provided by operating activities $ (10,093) $ (3,981)  
Increase (decrease) in cash provided by financing activities $ (4,590) (9,213)  
Accounting Standards Update 2016-15 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in cash provided by operating activities   (5)  
Increase (decrease) in cash provided by financing activities   5  
Accounting Standards Update 2016-18 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase (decrease) in cash provided by investing activities   $ 69  
Retained Earnings [Member] | Accounting Standards Update 2016-01, Equity Investments Previously Measured at Cost [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ 10
Retained Earnings [Member] | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     (4)
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     91
Other assets [Member] | Accounting Standards Update 2016-01, Equity Investments Previously Measured at Cost [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     10
AOCI Attributable to Parent [Member] | Accounting Standards Update 2016-01, Equity Investments Previously Classified as Available-for-sale [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     4
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     (91)
To Other Assets from Trading Assets [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     12
To Other Assets From Securities Available-for-sale [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     177
Trading Assets [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     (12)
Available-for-sale securities [Member] | Accounting Standards Update 2016-01 [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative effect of new accounting principle in period of adoption     $ (177)