v3.19.3.a.u2
Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2018
 [1]
Jan. 01, 2017
 [2]
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive income, beginning balance $ 4,249 $ 7,017 $ 4,961    
Other comprehensive income (loss) before reclassification, net of tax 2,635 (801) 1,661    
Amounts reclassifed from accumulated OCI, net of tax (1,414) (1,309) (1,134)    
Net other comprehensive income (loss), net of tax 1,221 (2,110) 527    
Amounts reclassified to retained earnings       $ (658) $ 1,529
Accumulated other comprehensive income, ending balance 5,470 4,249 7,017    
Foreign Currency Translation Adjustment [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive income, beginning balance (3,084) (2,054) (1,995)    
Other comprehensive income (loss) before reclassification, net of tax 28 (1,030) 20    
Amounts reclassifed from accumulated OCI, net of tax [3] 0 0 0    
Net other comprehensive income (loss), net of tax 28 (1,030) 20    
Amounts reclassified to retained earnings       0 (79)
Accumulated other comprehensive income, ending balance (3,056) (3,084) (2,054)    
Net Unrealized Gains (Losses) on Available-for-Sale Securities [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive income, beginning balance (2) 660 541    
Other comprehensive income (loss) before reclassification, net of tax 50 (4) 187    
Amounts reclassifed from accumulated OCI, net of tax [3] 0 0 (185)    
Net other comprehensive income (loss), net of tax 50 (4) 2    
Amounts reclassified to retained earnings       (658) 117
Accumulated other comprehensive income, ending balance 48 (2) 660    
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive income, beginning balance 818 1,402 744    
Other comprehensive income (loss) before reclassification, net of tax (900) (597) 371    
Amounts reclassifed from accumulated OCI, net of tax [4] 45 13 39    
Net other comprehensive income (loss), net of tax (855) (584) 410    
Amounts reclassified to retained earnings       0 248
Accumulated other comprehensive income, ending balance (37) 818 1,402    
Defined Benefit Postretirement Plans [Member]          
Accumulated Other Comprehensive Income Loss [Line Items]          
Accumulated other comprehensive income, beginning balance 6,517 7,009 5,671    
Other comprehensive income (loss) before reclassification, net of tax 3,457 830 1,083    
Amounts reclassifed from accumulated OCI, net of tax [5] (1,459) (1,322) (988)    
Net other comprehensive income (loss), net of tax 1,998 (492) 95    
Amounts reclassified to retained earnings       $ 0 $ 1,243
Accumulated other comprehensive income, ending balance $ 8,515 $ 6,517 $ 7,009    
[1]
With the adoption of ASU 2016-01, the unrealized (gains) losses on our equity investments are reclassified to retained earnings (see Note 1).
[2]
With the adoption of ASU 2018-02, the stranded tax effects resulting from the application of the Tax Cuts and Jobs Act are reclassified to retained earnings (see Note 1).
[3] (Gains) losses are included in Other income (expense) - net in the consolidated statements of income.
[4] (Gains) losses are included in Interest expense in the consolidated statements of income (see Note 13).
[5]
The amortization of prior service credits associated with postretirement benefits is included in Other income (expense) in the consolidated statements of income (see Note 15).