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Stockholders' Equity (Components of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net current period other comprehensive income (loss) $ (381) $ 55 $ (264) $ 322
Net current period other comprehensive income (loss) 79 (1) 79 (3)
Defined Benefit Pension Plans        
Defined benefit and other postretirement benefit plans - Beginning balance     (976) (1,097)
Other comprehensive income/(loss) before reclassifications     27 (17)
(Income)/loss reclassified from AOCI [1]     39 15
Net current period other comprehensive income (loss)     66 (2)
Tax effects reclassified from AOCI     (125)  
Defined benefit and other postretirement benefit plans - Ending balance (1,035) (1,099) (1,035) (1,099)
Other Postretirement Benefit Plans        
Defined benefit and other postretirement benefit plans - Beginning balance     (39) (31)
Other comprehensive income/(loss) before reclassifications     13 0
(Income)/loss reclassified from AOCI     (1) [1] 0
Net current period other comprehensive income (loss)     12 0
Tax effects reclassified from AOCI     (5)  
Defined benefit and other postretirement benefit plans - Ending balance (32) (31) (32) (31)
Cash Flow Hedges and Other        
Cash flow hedge and other - Beginning balance     (40) 5
Other comprehensive income/(loss) before reclassifications     15 (37)
(Income)/loss reclassified from AOCI     13 (3)
Net current period other comprehensive income (loss)     28 (40)
Tax effects reclassified from AOCI     (8)  
Cash flow hedge and other - Ending balance (20) (35) (20) (35)
Unrealized Translation        
Unrealized translation - Beginning balance     (1,864) (2,351)
Other comprehensive income/(loss) before reclassifications     (254) 310
(Income)/loss reclassified from AOCI     1 0
Net current period other comprehensive income (loss)     (253) 310
Tax effects reclassified from AOCI     (18)  
Unrealized translation - Ending balance $ (2,135) $ (2,041) $ (2,135) $ (2,041)
[1] Included in computation of net periodic benefit costs.