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Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Deferred Tax    
Balance $ (136) $ (39)
Changes in value (3) (6)
Amounts reclassified to earnings (1) (3)
Amounts reclassified to retained earnings   0
Balance (140) (48)
Net of Tax    
Balance [2] 10,042 [1] 8,788
Changes in value 7 13
Amounts reclassified to earnings 3 13
Amounts reclassified to retained earnings   7
Balance 9,802 8,388 [2]
Pension and Other Postretirement Liabilities    
Before Tax    
Balance (663) (1,102)
Changes in value 5 23
Amounts reclassified to earnings 4 16
Amounts reclassified to retained earnings   0
Balance (654) (1,063)
Investments and Other    
Before Tax    
Balance (4) (6)
Changes in value 5 (4)
Amounts reclassified to earnings 0 0
Amounts reclassified to retained earnings   7
Balance 1 (3)
Accumulated Other Comprehensive Income (Loss)    
Net of Tax    
Balance [2] (803) (1,147)
Balance $ (793) $ (1,114) [2]
[1] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.
[2] Amounts adjusted due to the adoption of Accounting Standards Update No. 2016-02, Leases (Topic 842). See Note 1 to the financial statements contained in Part I, Item 1 of this report for additional information.